this totally makes no sense...
Verizon/Sprint = DUAL BAND (800mhz/1900mhz) eveywhere
Cricket = TRY BAND (800mhz/1900mhz some places, exept AWS) (1700mhz in AWS)
Verizon/Sprint phones are only DUAL BAND, meaning no native AWS cricket access...
however, you are actually using the PREMIUM EXTENDED COVERAGE, sprint has made agreements for cricket to use sprints network but only TALK/TEXT/CALLER ID/CALL WAITING/ basic features, BUT NO DATA...
and the point of them having an AWS market is to make money, hence all of the bandwidth is already taken by verizon/sprint..but they overcame the TALK/TEXT by making roaming arrangements...